Well, we all know this can change quickly, so let's just ask, what is your favorite brand at the moment?
Definitely paisley .
Olight or ThruNite
SOLARFORCE
It’s a toss-up between FandyFire and UranusFire.
Going to have to say 4Sevens. For one reason. They do everything I want a light to do and I only have two gripes. Neutral models are rare and the only 18650 models they have are huge tactical lights.
If they had a Quark X 18650 in neutral white, I would be very happy.
4Sevens is the only "head loose/head tight" to access different mode groups type of light that I have ever owned that doesn't malfunction with a loose head. My replacement ThruNite from Goinggear.com has been awesome though, loose or tight head it works perfectly. The one I sent back to them...not so great.
touchéJack
Solarforce. At the moment, I don´t own too many lights.
DQG: running up.
I can say xtar but probably because of the consistency. The somethingFIRES are inconsistent clones of clones that is probably safe to assume that if you have a trustFire it is a fake clone of an uniquefire already being a clone of a fake romisen that copied it of an original trustfire if such a thing even exist.
I think when factories produce a budget flashlight the managers order what is being made. It probably shoud go like this:
Hey boss we managed to make that lot of 10.000 flashlights Fandyfire model xy.
Are those already engraved?
Not yet, why?
Cancel that go for prairieFire since it is top shite atm.
Umm what model should i put on?
Oh you decide.
Boss... ?!?
Just put something and dispatch it to the client will'ya?
Umm, right...
LMAO 
FecalFire?
Sunwayman! I like their line a lot because of style, quality and UI's.
Solarforce because of their consistent quality and loads of available accessories. So far I've got an M8, M6, MPP1, MPP2, L2P, L2T, and an L2I as well as various switches, bezels, and extension tubes. Not a single problem with the lot. Everything works exactly as it should.
Solarforce and Fenix for different types of lights. I find these two the best quality/cost ratio, though some of the more recent fenix models are not so much to my liking..
I had some Sphincterfire last night, though I can't say I was too fond of it.
Olight and Fenix as I really like their lights that are at the top of a couple of intended categories. M3X for one and TK41 for another.
Shiningbeam is a good mix of quality and budget.
Tank .... pound for pound they are great budget lights
+1, I like buttlights
Why do i think you wanna sell us some stuff?
Nitecore.
Best mix of price, features, quality and reliability for my purposes. I just wish that they had a greater selection of tints.